var nette = nette || { };

nette.getValue = function(elem) {
	if (!elem) {
		var undefined;
		return undefined;
	}

	if (!elem.nodeName) { // radio
		for (var i = 0, len = elem.length; i < len; i++) {
			if (elem[i].checked) {
				return elem[i].value;
			}
		}
		return null;
	}

	if (elem.nodeName.toLowerCase() === 'select') {
		var index = elem.selectedIndex, options = elem.options;

		if (index < 0) {
			return null;

		} else if (elem.type === 'select-one') {
			return options[index].value;
		}

		for (var i = 0, values = [], len = options.length; i < len; i++) {
			if (options[i].selected) {
				values.push(options[i].value);
			}
		}
		return values;
	}

	if (elem.type === 'checkbox') {
		return elem.checked;
	}

	return elem.value.replace(/^\s+|\s+$/g, '');
}


nette.getFormValidators = function(form) {
	var name = form.getAttributeNode('name').nodeValue;
	return this.forms[name] ? this.forms[name].validators : [];
}


nette.validateControl = function(control) {
	var validator = this.getFormValidators(control.form)[control.name];
	return validator ? validator(control) : null;
}


nette.validateForm = function(sender) {
	var form = sender.form || sender;
	var validators = this.getFormValidators(form);
	for (var name in validators) {
		var error = validators[name](sender);
		if (error) {
			if (form[name].focus) {
				form[name].focus();
			}
			alert(error);
			return false;
		}
	}
	return true;
}


nette.toggle = function(id, visible) {
	var elem = document.getElementById(id);
	if (elem) {
		elem.style.display = visible ? "" : "none";
	}
}


nette.forms = nette.forms || { };